CVE-2023-53640 ASoC: lpass: Fix for KASAN use_after_free out of bounds

High 7.3 Published 7 Oct 2025 Updated 5 Aug 2026

A use-after-free vulnerability in the Linux kernel's LPASS audio driver allows local attackers to cause a denial of service or potentially execute code via out-of-bounds reads.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2023-53640?

CVE-2023-53640 is a high-severity use after free vulnerability in Linux kernel, published on 7 Oct 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

ASoC: lpass: Fix for KASAN use_after_free out of bounds

When we run syzkaller we get below Out of Bounds error.

"KASAN: slab-out-of-bounds Read in regcache_flat_read"

Below is the backtrace of the issue:

BUG: KASAN: slab-out-of-bounds in regcache_flat_read+0x10c/0x110 Read of size 4 at addr ffffff8088fbf714 by task syz-executor.4/14144 CPU: 6 PID: 14144 Comm: syz-executor.4 Tainted: G W Hardware name: Qualcomm Technologies, Inc. sc7280 CRD platform (rev5+) (DT) Call trace: dump_backtrace+0x0/0x4ec show_stack+0x34/0x50 dump_stack_lvl+0xdc/0x11c print_address_description+0x30/0x2d8 kasan_report+0x178/0x1e4 __asan_report_load4_noabort+0x44/0x50 regcache_flat_read+0x10c/0x110 regcache_read+0xf8/0x5a0 _regmap_read+0x45c/0x86c _regmap_update_bits+0x128/0x290 regmap_update_bits_base+0xc0/0x15c snd_soc_component_update_bits+0xa8/0x22c snd_soc_component_write_field+0x68/0xd4 tx_macro_put_dec_enum+0x1d0/0x268 snd_ctl_elem_write+0x288/0x474

By Error checking and checking valid values issue gets rectifies.

Weakness: CWE-416

Which versions are affected by CVE-2023-53640?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2023-53640?

Apply the vendor's patch.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2023-53640 being exploited?

There is no known exploitation of CVE-2023-53640 in the wild and no public exploit code.

All Linux kernel vulnerabilities

Sources

Also known as BELL-CVE-2023-53640, DEBIAN-CVE-2023-53640, GHSA-cw77-x75c-4fx8, ROOT-OS-DEBIAN-11-CVE-2023-53640, UBUNTU-CVE-2023-53640.